The Proof Research 20-inch carbon fiber barrel delivers exceptional accuracy and weight savings for .308 Winchester rifles with a 1:10 twist rate optimized for precision shooting.Proof Research 20-inch carbon fiber barrel.308 Winchester chambering with 1:10 twist ratePre-fit design specifically for Zermatt Origin actionsAdvanced carbon fiber construction for reduced weightPremium match-grade accuracy and performancePerfect for precision rifle builds hunting applications and competitive shooting where accuracy and weight reduction are critical factors.